{"id":"03a4b8c1-f383-4051-be0d-934271d10646","shortId":"zzxsdD","kind":"x402","title":"Pay-per-request premium API access on Base via x402 at $0.02/call — no keys, no rate limits.","tagline":"Pay-per-request premium API access on Base via x402 at $0.02/call — no keys, no rate limits.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request settled in USDC on Base.\n\nThe specific endpoint `/api/v1/products/32` is listed under the umbrella \"Premium API Access\" but its exact functionality is not documented beyond the title. The platform advertises no API keys, no rate limits, and instant access. Payment is handled via the x402 protocol: callers receive a 402 challenge with payment details, settle in USDC (contract 0x8335…2913 on Base), and gain access to the response.\n\nThe broader platform offers endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. Documentation pages exist but appear gated behind a wallet connection, so detailed schemas and response formats are not publicly available.","tags":[],"capabilities":["x402-payment","pay-per-request","base-network","usdc-settlement","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","Base USDC API","micropayment API"],"warnings":["No public documentation available — all doc pages require wallet connection","The specific functionality of /api/v1/products/32 ('Premium API Access') is undocumented","No request or response schema available","Platform appears to be a generic API marketplace; actual backend service quality is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/32","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what this specific endpoint returns, no request/response schema, and docs pages are gated behind wallet connection. The listing is effectively a stub with verified 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'/call':14,33 '0.02':13,32,82 '0x8335':143 '2913':144 '402':134 'Base USDC API' 'access':7,26,46,101,123,149 'advertis':114 'ai':70 'analysi':165 'analyt':69 'api':6,25,45,100,116 'appear':187 'avail':202 'base':9,28,54,89,146 'base-network' 'behind':189 'beyond':109 'broader':154 'caller':131 'categori':78 'challeng':135 'classif':168 'connect':192 'contract':142 'convers':180 'data':68,161 'detail':138,194 'document':108,183 'embed':169 'endpoint':40,61,92,157 'estim':177 'exact':104 'exchang':172 'exist':185 'export':162 'feed':171 'financ':73 'format':198 'function':105 'gain':148 'gas':176 'gate':188 'generat':182 'geocod':178 'handl':126 'infrastructur':76 'insight':163 'instant':122 'key':16,35,117 'learn':72 'limit':19,38,120 'list':95 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':42 'machin':71 'mani':60 'metric':159 'micropayment API' 'network':55 'no-api-key' 'no-rate-limit' 'offer':62,156 'one':58 'page':184 'pay':2,21 'pay-per-call API' 'pay-per-request':1,20 'payment':50,124,137 'per':3,22,83 'platform':65,113,155 'premium':5,24,44,99 'price':80,170 'protocol':51,130 'provid':43 'public':201 'quot':175 'rate':18,37,119,173 'receiv':132 'report':160 'request':4,23,84 'respons':152,197 'schema':195 'sentiment':164 'settl':85,139 'span':67 'specif':91 'summar':167 'text':166 'titl':111 'token':174 'umbrella':98 'usdc':87,141 'usdc-settlement' 'util':77 'valid':179 'via':10,29,47,127 'wallet':191 'web3':74 'x402':11,30,49,129 'x402 API' 'x402-payment'","prices":[{"id":"d7e15967-c55a-441c-834f-e01bda5b01f1","listingId":"03a4b8c1-f383-4051-be0d-934271d10646","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:15.517Z"}],"sources":[{"listingId":"03a4b8c1-f383-4051-be0d-934271d10646","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:15.517Z","lastSeenAt":"2026-04-23T13:30:32.202Z"}],"details":{"listingId":"03a4b8c1-f383-4051-be0d-934271d10646","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/products/32 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/32"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/32"}],"useCases":["Accessing premium API services without managing API keys or subscriptions","Programmatic pay-per-use access to data, AI, finance, or utility endpoints","Agent-driven workflows that need instant, keyless API access settled on-chain"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer on-chain micropayments over traditional billing"],"notFor":["Users who need detailed API documentation before purchasing (docs are sparse/gated)","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.466Z"},"updatedAt":"2026-04-23T13:30:32.202Z"}}